Shearing tool



5. l. RAYNER SHEARING TOOL Oct. 29. 1940.

Filed Dec. 20, 1938 m N m M A r TOR/VEy Patented Oct. 29, 1940 SHEARINGTOOL 'Samuel I. Rayner, San Jose, Calif., assignor of one-half to DonaldR. McCormack, San Jose,

Calif.

Application December 20, 1938, Serial No. 246,813

Claims.

The present invention relates particularly to shears for cuttingcorrugated sheet material such as corrugated iron. While corrugatedcardboard or other material may be cut with equal facility,

5 corrugated iron willbe specifically referred to in the followingspecification.

It is one object of the present invention to provide a tool of thecharacter indicated that may be quickly and easily made operable to outeither corrugated material or fiat material.

It is another object of the invention to provide a tool of the characterindicated constructed and arranged to hold the material firmly in placeduring the cutting operation, and to effect the cutting cleanly andaccurately without deformation of the sheet.

It is still another object of the invention to provide a tool of thecharacter indicated that will be economical to manufacture, positiveinoperaposed in spaced parallel relation to each other as 7 shown. Theseplates are mounted upon a handle 3 at one end, which handle forms aspacing means for that end, and upon a link 4 at the other end, whichlink forms a spacing means for that end. The plates I, 2 are oblong inform, each plate having one of its longer edges straight and the otherlong edge undulating as shown at Ia and lb respectively, and 2a and 2b.These undulatory edges form a seat for the material to be cut, and ofcourse the undulations have the same curvature as said material.

In the present instance the link 4 is bolted between the plates I and 2as at 5 and has holes 6 and I formed therein and equally spaced onopposite side of bolt 5. The plates I, 2 are also bored through as at 8so that the link may be rigidly tion, simple in form and construction,strong,

is a blade I0, this blade being disposed to lie in the plane of link 4and to slide snugly between plates I and 2.

The cutting edge of the blade I0 is formed into spaced teeth-as at II,I2, I3, I4 with interven-' ing substantially straight edges I5, Iii, H,the edge asa whole being angularly disposed relative to the lever B, andthe edge parts I5, IE5, I? having varying angular relationship thereto.The

teeth II, I2, I3, I4 are so spaced that when the blade is brought downto enter the slot I8 between the plates I, 2 they will successivelyenter the sheet metal, shown in dotted lines at I9, at the lowest andhighest points of its undulations. The angularity of the edge sectionsI5, It, I1 and 29 is such that they cut in both directions from theentering tooth, each tooth entering the metal before the precedingportion has been entirely cut away, thereby holding the sheet solidly onthe plates.

In the initial movement of the blade the tooth II enters the metal at II a, then passes through positions I lb and I Ic, cutting in thedirection I Id. During this operation the tooth I2 enters the metal atI2a and passes through the positions I 2b and I2c, with the edge portion25 cutting in the direction 15d, and the edge portion I6 cutting in thedirection ltd. Before the edge portion I 6 has cut entirely through thetooth I3 has passed through positions I3a, I3b to E30 where it entersthe metal. This is followed by tooth I4 passing through positions I411,I41) and Me where it enters the metal and is followed by edge I! cuttingin the direction I'Id. In the cutting operation described'a ribbon iscut out corresponding to the width of the slot I8.

If it is desired to cut fiat metal, then the bolt 2I is removed, thelink 4 is swung around into the position shown in Figure 3, and the boltZI replaced through holes I and la. A blade as 22 on lever 8 and havinga suitable cutting edge 23 may now be used in a manner similar to bladeII].

It will be noted that in the device described the rear edges of theseveral teeth are concentric with the pivotal point of the lever 8 sothat they exertno pressure against the metal tending to displace thesame.

Although a certain specific embodiment of the invention has beenillustrated and described it will be understood that variousalterationsin the 50 details of construction and mode of assembly may 1 be madeWithout departing from the scope of the invention as indicated in theappended claims.

I claim:

1. Ina shearing tool including a pair of spaced parallel plates disposedto form a slot and having their corresponding longer edges similarlyundulated to form a seat for corrugated sheet material, and a shearingblade pivotally mounted thereon in spaced relation to said plates andmovable into the slot between the plates, said blade having spaced teethformed thereon with intervening cutting edges, said edges being disposedto cut in opposite directions from the point at which each intermediatetooth enters corrugated material on the plates and said teeth cuttingonly in the direction of said pivot.

2. In a shearing tool including a pair of plates disposed to form a slotand having corresponding longer edges similarly undulated to form a seatfor corrugated material and to form cutting edges therefor, and a bladepivotally mounted on the plates to enter said slot; said blade havingteeth formed thereon spaced apart substantially equal to the spacingofthe highest and lowest points of the undulations in the plates andadapted to engage the material at such points, those edges between theteeth being disposed to form obtuse angles with the teeth whereby to cutthe material in opposite directions from the points of entry of theteeth into the material.

3. In a shearing tool including a pair of spaced parallel platesdisposed to form a slot and having their corresponding longer edgessimilarly undulated to form a seat for corrugated material, and ashearing blade pivotally mounted thereon in offset relation to saidplates and movable into the slot between the plates; said blade havingspaced teeth formed thereon disposed to enter the lowest and highestpoints in the undulations of the material in succession and said teethbeing formed to out only in the direction of the pivotal mounting.

4. In a shearing tool, including a bed plate having an upper shearingedge formed to conform to the undulations of a piece of corrugatedmaterial, a shearing blade, and a pivot connecting said shearing bladeto said bed plate for cooperationtherewith; a plurality of spaced teethon said shearing blade, the edges of said teeth facing towards saidpivot connection being formed to provide cutting edges, the edges ofsaid teeth remote from said pivot being defined by arcs concentric withsaid pivot, and intermediate shearing edges on said shearing bladebetween said teeth.

5. The structure of claim 4, and said teeth being spaced apart adistance substantially equal to the space between the highest and lowestpoints of the corrugations of said material and adapted to engage thematerial at such points.

SAMUEL I. RAYNER.

